Maintenance on Leandra is finished. I took her offline around 2100 ESET5EDT on Saturday night to remove a dead DVD-ROM drive, remove a pair of 512GB memory modules that weren't doing anything, and swap out her 250 GB hard drive for a 500 GB drive. The RAID array has had 250 GB added to it; specifically, the logical volume holding everything but the /boot and / partitions has had 250 GB added to it. 15 GB from the free pool was added to /usr (so that more software could potentially be installed) and the rest of the free disk space was added to /home (where everyone's files and web content are kept).

In case you're curious about how I did it, the procedure is under the cut. If you're not interested, don't worry about it.

Mark the partitions from /dev/sdb (the smaller hard drive) bad so they can be removed from the array: mdadm /dev/md0 --fail /dev/sdb1 && mdadm /dev/md0 --remove /dev/sdb1 (/boot)